MHT CET 2023 Physics question

Physics Wave Optics MHT CET 2023

The path difference between two identical light waves at a point Q on the screen is 3 m. If wavelength of the waves is 5000 Å then at point Q there is

(A)3 dark band
(B)4 bright band
(C)5 dark band
(D)6 bright bandCorrect

Answer: (D)

Solution

Convert the data to the same unit: Å and Å. Then , so the path difference is exactly , an integral multiple of . The condition

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Question ID VK-097814